A Belle Époque emerald and diamond ring, by Tiffany & Co. Estimate: $25,000 – $30,000. Photo Christie's Image Ltd 2015

Set with a circular cabochon emerald, weighing approximately 6.57 carats, to the rose-cut diamond gallery and single-cut diamond shoulders, circa 1915, ring size 6 3/4, mounted in platinum - Signed Tiffany & Co. (partially indistinct)

Christie's. IMPORTANT JEWELS, 20 October 2015, New York, Rockefeller Plaza